Pneumatic grease pump



Juvnvxe 17,` 1930. 11B. BENNETT 1,754,926

PNEUMAT I C GREASE PUMP Filed March l5 1926 29 3 Z 35` 39 Z8 1 8 L2;

2 sheets-sheet 1 June 17, 19.30. T B BENNETT l 1,764,926

PNEUMATIC GREASE vPUMP Filed March l5 l1926 2 Sheets-Sheet 2 Z7@ 4 g@ 36 [31g y 8 41 lnuenfov r GOYMQL t unir g stares PTE rnoivrAs is. BENNETT, vor :'lvIUsKEsoN,V MICHIGAN, AssIGNonro isIiNNnrT'rUMrs con-V A fronA'rIoN, or MUsKnGcN, MIcI-I'IGAN, A coRPoaArIoN :or MICHIGAN y rNEUMATIc GREASE PUMP Application' medal/[arch 15, 1926. Serial No. 94,674.` i

This invention relates kto anair operated grease dispensing pump. It is desirable in the dispensing of grease to supply a highV pressure grease gun as it is called, with a `continuous supply'of grease fromV a relatively large reservoir or container of grease. The grease which isisupplied `to the high pressure gunris'supplied ycontinuously and LinderV relatively -low 'pressure but sutiicient that it willV force the greasethat is needed into the high pressuregun.

In the present invention it is designed that a relatively largecontainer of grease may be equipped 4with an air operated grease pumping outit which may be readily operated by compressed air so as to continuously dispense grease under suilicient pressure that it will continuously supply the high pressure gun with the desired and necessary amount ofgrease or dispense the grease to any otherl desired place.

Theinvention consists in manyV novel details of construction and arrangements 'of parts for attaining this end,as well as many others not at this time particularly `enume- Fig.` 3 is a `fragmentary enlarged'view` similar-to Fig; 1` showing a diierentform of the construction wherein the pumping" piston is operated in both pressed air, and

Fig. l is an enlarged horizontal section through the air control valve usedwith the orm'of the inventionV shown in Fig. 3.

Like reference characters refer to like parts in the different figures inthe ,drawings.

directions `by com- The main `supply of 'grease Visv containedwithin a receptacle or other container '1,

which is preferably of sheet metal,` having a bottom 2 the upper endbeing closed by a top 3. This topi is provided with an opening which is normally covered by plate` l detachably secured in place by the thumb` screws 5 shown. i

. A verticalpump barrel 6 is located with-4 inthe container -1 andA at its lowerl end is seated in a seatformed at the upper end of a casting 7 .which tapers downwardly Vand inwardly for a distance..4 The upper end of f the barrel is received in a seat formed in the under side of a member 8bolted Vor otherwise suitably secured permanently to the?y Y plate-@which plate has a 'circularopening i" for the upper end ofbarrel. `Thecylinder` is secured in placein thefusual and welll known manner by rods Vwhich vextend through the members-7 and 8. TheseA rods are not shown in the `drawing butthelower nuts 9 attached to the' ends of the rods are shown below the upwardly extending flangeat the upper end ofthe member 7. i,

The Vmember. 7 atits lower portion is eX-` tended downwardly making a cylindricali projection lOinteriorly threaded for the rei ception of the upper threaded end of a short pipe 11 which extends downwardly to the f bottom 2 of receptacle 1. The lower end oi pipe 11 is cut atan angle, indicated at 12, for providing a wide entrance for grease from the receptacle into the lower end to pipe 11.

A web `13 having vertical openings through it is `cast integral with and extends across member 7 at the upper end of part 10. A valve plate 14 lies above this web and normally closes the openings when lower position- A pin 15 extends'fromV the center of `the valves plate downwardly through the web and a cotterpirris passed throughthe lower end of pin 15 so that the vertical `movement of the valve plate is limited upwardly by the engagement of the cotter pin'` against the under side of web 13.

The plate 8 at theupper end of cylinder 1 6 -is formed for the mounting oa suitable stuiiing box lfthrough-which a vertical piston rod 17 passes. The lower end'of the rod V is equipped with a piston 18 which has verticalopenings through it normally covered and closed by amovable valve plate 19 slidsion 22to'which anysuitable f leXiblehose y connection may be attached, at its outer end having the high pressure grease gun secured thereto 1n the usual manner. The outlet neck`21 is formed with openings -225L in opposite sides which when theyare not' used may be closed by suitable screw plugs but which, if it is desired to have more than one line of hose runrfrom the apparatus, may be removed and replaced by a suitable connection having a hose attachment'which connection can thread into opening 22a?.

Above the member 8 a supporting standard 23 is located and it is secured in place by the same rods and nuts used to bind the barrel 6 and the member 7 and 8 together. This casting has a horizontal web 24 across it between its upper and lower ends, the rod 17 passing through the web and through the usual form of sturling box 25 which prevents Aao the escape of air around the piston rod from above the web 24 as will later appear.

A cylinder 26 is located above and its lower edge is received in a suitable seat formed in the upper end of the standard 23.

The upper end of the cylinder is closed by.

an upper head 27 Aand this head andthe barrel are secured-to the lstandard'23 by `rods 28 which pass through the flanges' on the head 27, and on the standard 23.

The upper end of the piston rod 17terminates within the cylinder 26 and a somewhat larger rod 29 is attachedV to its upper end and extends through the head 27 being equipped at its upper outer end with a knob 30. A valveless piston 31 is located within the cylinder 26 and secured to the rod 29. The piston 31 is of conventional construction having an outer cupleather associated therewith, which will` notv permit'the escape of air upwardly past the piston.

Compressed air is carried through an inlet pipe 32 to al valve casing 33 and therefrom through a short pipe connection 34 into the standard 23, any air passing therein going into the cylinder 26 below the piston 31. The valve 35 mounted within the casing 33 is designed to be turned about a vertical aXis by handle 36.' Valve 35 has a horizontal passage 37 through it and also a lateral smallerbranch passage 38`rom the passage 37 to theV outer sideot the valve. And the casing33 is provided with a vent opening 39 in one side. I

In the operation of this construction,

Yvalve 35 is turned from the positionshown in Fig. 2 so that the passage 38 aligns with the pipe 34 and the passage 37 at one end joins with the vent opening 39. The knob 30 may then be operated so as to push the piston rod downwardly any air under the piston 31 passing outwardly ythrough the vent opening 39, while with the downward movement of the piston 18, grease flows upwardly therethrough elevating the valve q plate 19. The valve 35 may then jbe turned to position shown in Fig. 2. This will open the passage from air inlet pipe 32 to the cylinder 26 and compressed air flowing into the cylinder and under the piston 31 will tend to elevate said piston andthe rods connected therewith, forcing the grease above piston 18 outwardly through the neck 21 and the hose attached to the outlet 22. The pressure of the compressed air need not be high to accomplish this. As the grease is dispensed from the high pressure gun attached to the hose, piston 18 is elevated more and more and thus keeps the high pressure gun con. tinuously supplied. Of course, this greasing outlit is quite as useful for dispensing grease through a hose outlet whether or not a high pressure grease gun is attached at its end and, in many instances, it will be used merely as a dispensing outt for conveying grease from the container 1 to a transmission or differential gearing casing in an automobile or to any other place where a lubrication is desired without the interposition of a high pressure grease gun; and with more than one outlet yto the neck 21, both the high pressure grease gun attachment and the regular measured quantity grease` dispensing hose may be used. In any event the grease is dispensed outwardly with the upper movement of the piston 18 which goes upwardly under the force of airl pressure against piston 30 as the grease passes out through the neck 21. Y f With the upward movement of the piston 18 valve plate 19 drops to its lower position shown in Fig. 1 and the grease above the piston cannot return through the piston downwardly, but grease from the container will pass upwardly through the pipe 11, elevating the valve plate 14 and passing by it sothat the barrel 6 is lilled below the piston 18 as said piston moves upwardly: and on the down stroke of the piston 18 valve plate 14 moves to `lower closing position shown in Fig. 1 and the grease below the piston 1.8 passes upwardly through it and by the valve plateA 19 as previously described.

Instead. of operating the rod 17 and the attached pistons downwardly by hand as described with reference to the construction shown in Fig. 1, the operation of the rod 17 in bothdirections may be effected by air pressure. The construction for accomplishing this is shown in Fig. 3 wherein the cylinder 26 is provided with a somewhat dif-Y ferent form of head plate 27a having an inlet portion 40 as shown. The rod E29 and the `knob 30 are eliminated and the piston 3l'r1 is secured atthe upper end of the rod 17. Pipe sections 34hV and 34a are threaded into the inlet member 40 and through the standard 23, at both the upper and lower ends of the cylinder 26; The compressed air is carried through an inlet pipe al to a valve casing 33a which has upwardly and p downwardly extending pipes l2 connected therewith, the same being connected at their upper and lower ends respectively with the pipe sections 3&1 and 3ft previously noted. The valve 43 in casing 33a is of a torni such that by turning it to one position, as shown by Fig. a, air may pass from the pipe /tl through the pipe l2 to above the piston 3la while the air below the piston will be vented outwardly through the lower pipe 42 and the vent opening 39; and when the .valve is turned to another position this passage of the air will be reversed, the compressed air going into the cylinder below the piston 31a and the air above piston venting outwardly throughvent opening 39. The upward and downward movements or' the grease dispensing piston 18 in this manner are both controlled by compressed air instead of the upward movementalone as shown in the con* struction illustrated in Fig. l; otherwise the operation of the two forms of the apparatus are identical.

Y This construction of grease dispensing apparatus is very practical and effective and is of particular value in garages where the dispensing of grease for lubricating automobiles is common. The apparatus is. readily operated by compressed'air, is easily controlled and the grease can be dispensed to where it is used very conveniently and expeditiously without the necessity of the one handling the apparatus coming into contact with the grease inany manner. The invention is defined inthe appended claims and all forms of structure coming within the scope of vsaid claims are to be considered as comprehensive'of the invention.

I claim l. In a construction of the class described, f

a container for lgrease having anv upper end with an opening therein, a grease pump adapted to becinserted through said opening in thev end of the container and located inV said container, comprising a grease pump cylinder, a lower cylinder head with an in let valve and means communicating with said inlet valve and extending near the bottom pf the container, a piston in the grease pump cylinder, a passage through said piston, a check valve in said passage, an upper cylinder head having a grease outlet above the head of the container, a plate connected with said upper cylinder head covering said opening in the end of the container and supporting the structure, a piston rod attached to said piston and extending through said upper piston head and pneumatic means located above theupper piston head and connectedV with said piston rod for reciprocating said rod and piston.

2. In a construction of the class described, a `container for grease having an upper end with an opening therein, a cylinder and piston type grease pump `adapted to be inserted and a grease outlet from the upper end oiV the oil pump cylinder outside of the container.

In testimony whereof I aiix my signature. u

rHoMAs B. BENNETT. 

